If you ask who made those predictions, the answer is people trying to give hope to others, whether it's a false hope based on their imagination or a genuine hope based on their analysis. But after all, no one knows how to continue a project in the future, whether it is still running or will be lost because it cannot compete with other projects. So you don't have to worry about who makes the predictions because everyone can make predictions based on what they know and then share it through social media. And we know that social media is a powerful tool to help us spread what we want.
They give hope to others or they get paid to make those predictions. I wonder if they are really experts in the market?, Predicting the value or future of a coin is impossible, even if it is bitcoin. The market is always volatile and always risky, especially altcoins, altcoins can die at any time. And making predictions for the next 10 years is too far-fetched.
They feel they can guess because they master the data, especially history, and whatever their opinions certainly will never guarantee that they can provide 100%profit, if they are sure with predictions then without asking others to buy and like those who are the first to buy.